Identifier: textbookofbotany00sach (find matches)
Title: Text-book of botany, morphological and physiological
Year: 1875 (1870s)
Authors: Sachs, Julius, 1832-1897 Bennett, Alfred W. (Alfred William), 1833-1902 Thiselton-Dyer, William T. (William Turner), 1843-1928
Subjects: Botany
Publisher: Oxford, Clarendon Press
Contributing Library: NCSU Libraries
Digitizing Sponsor: NCSU Libraries

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lie in three straight rows parallel to the axis, eachembracing a third of the diameter of the stem. In Fig. 101, B and C, the segmentsare numbered /, //, ///, &c., according to the order of their formation, and arerepresented as they appear when the apex of the stem is seen from above and * These side-walls are pieces of the principal walls of the previously existing adjoiningsegments, as is seen in B and C. 122 MORPHOLOGY OF TISSUES. without (not in transverse section), or as if the arched surface of the apex wereremoved and spread out flat. If the segments are followed according to theorder of their numbering, and the path thus described is indicated by a continuousline, a spiral is obtained, which is in reality an ascending spiral line, because eachsegment lies higher than the older ones, as is shown in Fig. toi, B, where,however, only two rows of segments are to be seen from without. The formationof tissue begins by each segment breaking up, soon after its production, into two
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Fig. ioi.—Apical regions of the stem of an Equisetum; A longitudinal section of an underground very strong bud otE. Telntatgia, in September (XSSo); B view of the apex from above (both from nature); C, D, E the same of E. ar-vense (afterCramer). Q diagrammatic ground-plan of the apical cell and of the youngest segment; D external view of a slender stem-apex ;E transverse section through this from / to /); 5 is in all cases the apical cell, /, //, ///, &c. the segments; i, 2, 3, &c. thedivision-walls in the segments in the order of their formation ; x, y, b, bs in A the first rudiments of leaves. equal plates, a division-wall springing up parallel to the principal walls, indicatedin B, C, and 7? by i, i. Since in each of these two half-segments which lie one onanother the further processes are almost exactly the same, it is necessary to keepin view only one half. Each half of the segment becomes divided first of all by avertical curved wall, which meets internally a side-wall

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